A cylindrical metal tube (3) accommodating therein a thermistor device (2), the electric characteristics of which change with temperature, is pushed into, or clamped and fixed to, a sheath portion (42) positioned on a flange (4) to the rear of a projection portion (41) of the flange (4), and is lase
A cylindrical metal tube (3) accommodating therein a thermistor device (2), the electric characteristics of which change with temperature, is pushed into, or clamped and fixed to, a sheath portion (42) positioned on a flange (4) to the rear of a projection portion (41) of the flange (4), and is laser welded in a circumferential direction. A weld portion (L1) formed to bridge the metal tube (3) and the sheath portion ( 42) of the flange (4) firmly fixes the metal tube (3) to the flange (4). In the temperature sensor (1) having this construction, the weld portion (L1) between the metal tube (3) and the flange (4) is not exposed to a high temperature environment. Therefore, oxidation hardly occurs at the weld portion and reliability of air tightness to an exhaust gas can be improved.
대표청구항▼
What is claimed is: 1. A temperature sensor including: a cylindrical metal tube having a distal end thereof closed and extending in an axial direction; a device accommodated in said metal tube and having electric characteristics thereof changing in accordance with temperature; and a flange encompas
What is claimed is: 1. A temperature sensor including: a cylindrical metal tube having a distal end thereof closed and extending in an axial direction; a device accommodated in said metal tube and having electric characteristics thereof changing in accordance with temperature; and a flange encompassing an outer peripheral surface of said metal tube; wherein said flange includes a sheath portion extending in the axial direction and a projection portion positioned on a distal end side of said sheath portion and protruding outward in a diametric direction, said projection portion having a seat surface at a distal end thereof, said metal tube is pushed into, or clamped and fixed to, at least said sheath portion, and said metal tube and said sheath portion are welded in a circumferential direction rearward of said seat surface; said temperature sensor further including a sheath member having built-in metal core wires having said device connected to a distal end side thereof and lead wires for connecting an external circuit, connected to a rear end side thereof, and a cylindrical joint bonded air-tight outside said sheath portion of said flange in the diametric direction and extending rearward in the axial direction, wherein the distal end side of said sheath member is inserted into said metal tube, and the rear end side of said metal tube and the distal end side of said lead wires are arranged inside said joint; and wherein said sheath portion has a two-step shape including a distal end step portion positioned on a distal end side and a rear end step portion having an outer diameter smaller than that of said distal end step portion, said metal tube is welded to said rear end step portion of said sheath portion and said joint is bonded to an outer peripheral surface of said distal end step portion in a circumferential direction. 2. A temperature sensor including: a sheath member including built-in metal core wires having a device connected to a distal end side thereof, said device having electric characteristics changing in accordance with temperature, and lead wires for connecting an external circuit, connected to a rear end side thereof, a cylindrical metal cap having a distal end thereof closed, extending in an axial direction and having an inner periphery on the rear end side thereof bonded to an outer periphery on the distal end side of said sheath member in a circumferential direction while accommodating therein said device; and a flange encompassing the outer periphery of said sheath member; wherein said flange includes a sheath portion extending in the axial direction and a projection portion positioned on the distal end side of said sheath portion and protruding outward in a diametric direction, said projection portion having a seat surface at a distal end thereof, said sheath member is pushed into, or clamped and fixed to, at least said sheath portion, and said sheath member and said sheath portion are welded in a circumferential direction rearward of said seat surface and, wherein said sheath portion not including the projection portion has a two-step shape including a distal end step portion positioned on a distal end side and a rear end step portion having an outer diameter smaller than that of said distal end step portion, and said sheath member is welded to said rear end step portion of said sheath portion, and wherein said sheath portion has an outer diameter smaller than that of the projection portion. 3. A temperature sensor, adapted for measuring the temperature of a gas flowing inside a gas passage, said gas passage having a fitting portion for receiving said temperature sensor, said temperature sensor including: a cylindrical metal tube having a distal end thereof closed and extending in an axial direction; a device accommodated in said metal tube and having electric characteristics thereof changing in accordance with temperature; and a flange encompassing an outer peripheral surface of said metal tube; wherein said flange includes a sheath portion extending in the axial direction and a projection portion positioned on a distal end side of said sheath portion and protruding outward in a diametric direction, said projection portion including a seat surface for mating with the fitting portion of the gas passage, said metal tube is pushed into, or clamped and fixed to, at least said sheath portion, said metal tube and said sheath portion are welded in a circumferential direction, and said flange is configured such that the welded portion is not exposed to gas flowing inside the gas passage when said temperature sensor is positioned in the fitting portion of the gas passage; said temperature sensor further including a sheath member having built-in metal core wires having said device connected to a distal end side thereof and lead wires for connecting an internal circuit, connected to a rear end side thereof, and wherein said sheath portion has a two-step shape including a distal end step portion positioned on a distal end side in a rear end step portion having an outer diameter smaller than that of the distal end step portion, and said sheath member is welded to said rear end step portion of said sheath portion. 4. The temperature sensor as claimed in claim 3, wherein said seat surface is positioned at the most distal end of the projection portion. 5. The temperature sensor as claimed in claim 3, wherein when said temperature sensor is positioned in the fitting portion of the gas passage, the welded portion is outside the gas passage. 6. The temperature sensor as claimed in claim 1, wherein no welds are present at or forward of the seat surface. 7. The temperature sensor as claimed in claim 1, wherein said distal end step portion and rear end step portion are arranged rearward of said projection portion. 8. The temperature sensor as claimed in claim 2, wherein said distal end step portion and rear end step portion are arranged rearward of said projection portion. 9. The temperature sensor as claimed in claim 3, wherein said distal end step portion and rear end step portion are arranged rearward of said projection portion. 10. A temperature sensor including: a sheath member including built-in metal core wires having a device connected to a distal end side thereof, said device having electric characteristics changing in accordance with temperature, and lead wires for connecting an external circuit, connected to a rear end side thereof, a cylindrical metal cap having a distal end thereof closed, extending in an axial direction and having an inner periphery on the rear end side thereof bonded to an outer periphery on the distal end side of said sheath member in a circumferential direction while accommodating therein said device; and a flange encompassing the outer periphery of said sheath member; wherein said flange includes a sheath portion extending in the axial direction and a projection portion positioned on the distal end side of said sheath portion and protruding outward in a diametric direction, said projection portion having a seat surface at a distal end thereof, said sheath member is pushed into, or clamped and fixed to, at least said sheath portion, and said sheath member and said sheath portion are welded in a circumferential direction rearward of said seat surface and, wherein said sheath portion has a two-step shape including a distal end step portion positioned on a distal end side and a rear end step portion having an outer diameter smaller than that of said distal end step portion, and said sheath member is welded to said rear end step portion of said sheath portion, and wherein the projection portion has an upper surface arranged opposite the seat surface at a rear end thereof, and said distal end step portion and rear end step portion of said sheath portion are arranged above the upper surface of said projection portion.
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이 특허에 인용된 특허 (14)
Simons Robert A. (Austin TX), Modular temperature sensing apparatus.
Gennissen,Paulus Thomas Johannes; Borgers,Marc Gerard Johan; Kolling,Arie Jan; Zwollo,Cris Ruiz; Appelo,Roger Marcel; Kleissen,Werner John Peter, Sensor arrangement for measuring a pressure and a temperature in a fluid.
Houben, Hans; Zaiser, Rüdiger; Mayr, Friedrich; Buck, Helmut; Mohl, Markus; Hartmann, Robert; Lehmann, Heiner; Schneider, Werner; Marto, Arno; Kasimirski, Hans-Peter, Temperature sensor for a resistance thermometer, in particular for use in the exhaust gas system of combustion engines.
Houben,Hans; Hartmann,Robert; Lehmann,Helner; Schnelder,Werner; Marto,Amo, Temperature sensor for a resistance thermometer, in particular for use in the exhaust gas system of combustion engines.
Mogari, Satoshi; Ito, Masamichi; Ishikawa, Satoshi, Temperature sensor having a flow path for a brazing filler to flow between an outer surface of the tube and an inner surface of the mounting structure.
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